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Attributes of cut-off low induced rainfall over the Eastern Cape Province of South Africa

机译：南非东开普省临界低诱发降雨的属性

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摘要

Cut-off low (COL) weather systems that are associated with rainfall over the Eastern Cape are considered in this study. COLs are objectively identified and tracked over a 31-year period. Daily rainfall data of 22 evenly distributed stations over the Eastern Cape are utilized. Only COLs with a minimum spatial distribution, defined as more than a third of the rainfall stations that need to report rainfall on at least 1 day of a COL event, are considered for analysis of rainfall attributes. These attributes include the occurrence of COL rain days of different magnitudes, the distribution of the depth and temperature of the COL centres for the rain days of different magnitudes, the associated spatial distribution of rainfall as well as the associated atmospheric circulation. The frequency of COLs over the Eastern Cape has a winter maximum and a summer minimum. COL rain days of small, medium and large magnitudes occur most frequently during the winter, while small- and medium-magnitude COL rain days experience peaks in autumn and spring, respectively. The low-level flow, and in particular the position of the low/trough, seems to be the determinant factor in the occurrence, magnitude and spatial extent of COL-induced rainfall.
机译：这项研究考虑了与东开普省降雨相关的低切（COL）天气系统。在31年内客观地确定和跟踪了COL。利用东开普省22个分布均匀的站点的日降雨数据。仅考虑具有最小空间分布的COL（用于定义至少三分之一的COL事件中需要报告降雨的降雨站），才能进行降雨属性分析。这些属性包括不同量级的COL雨天的发生，不同量级的雨天的COL中心深度和温度的分布，相关的降雨空间分布以及相关的大气环流。东开普省的COL发生频率为冬季最大值和夏季最小值。在冬季，小，中和大震级的COL雨日最频繁，而中，小震级的COL雨日分别在秋季和春季经历高峰。低水平的流量，特别是低谷/低谷的位置，似乎是决定COL诱发降雨发生，大小和空间范围的决定因素。

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  • 来源
    《Theoretical and applied climatology》 |2014年第2期|307-318|共12页
  • 作者

    S. Molekwa; C. J. Engelbrecht; C. J. deW Rautenbach;

  • 作者单位

    Agricultural Research Council-Institute for Soil, Climate and Water, Pretoria, South Africa;

    Agricultural Research Council-Institute for Soil, Climate and Water, Pretoria, South Africa;

    Department of Geography, Geoinformatics and Meteorology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa;

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